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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Dual concentric speaker
Roland cube , tweeter over the 10 inch bass unit. Stands on what seems to be
a plastic stem passing through the bass cone, wires to it passing through that cone also. How to remove the tweeter section to get to ,hopefully, failing wiring joint that is normally covered by the dome of a single normal speaker. There is a square recess in that stem, a "Frenchman" to break a plastic weld joint ? no fixings proper seen anywhere. |
#2
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Dual concentric speaker
On Jun 14, 12:42*am, "N_Cook" wrote:
Roland cube , tweeter over the 10 inch bass unit. Stands on what seems to be a plastic stem passing through the bass cone, wires to it passing through that cone also. How to remove the tweeter section to get to ,hopefully, failing wiring joint that is normally covered by the dome of a single normal speaker. There is a square recess in that stem, a "Frenchman" to break a plastic weld joint ? no fixings proper seen anywhere. Which speaker element isn't working? Removing the tweeter support should be unnecessary for either repair job. |
#3
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Dual concentric speaker
spamtrap1888 wrote in message
... On Jun 14, 12:42 am, "N_Cook" wrote: Roland cube , tweeter over the 10 inch bass unit. Stands on what seems to be a plastic stem passing through the bass cone, wires to it passing through that cone also. How to remove the tweeter section to get to ,hopefully, failing wiring joint that is normally covered by the dome of a single normal speaker. There is a square recess in that stem, a "Frenchman" to break a plastic weld joint ? no fixings proper seen anywhere. Which speaker element isn't working? Removing the tweeter support should be unnecessary for either repair job. +++++ Working unreliably but not with me of course, probably loss of bass if speaker problem. Accessible joint at cone between a pigtail and intermediary? wire was suspect but as it did not look like VC wire I assume there is another join further in under a ring , access obscured by the tweeter assembly. Problem may also have been the "Recording Out" socket with 2 bypass switches inside the Jalco 1/4 in socket. One reduces the speaker output and one cuts speaker supply , via control (not carrying speaker current), I don't know why , perhaps one functions with mono and other with stereo jack inserted via pcb links (not seen as have not taken apart the whole amp). The closure force on the reducing contact only about 200 gram compared to about 400 gram on the full cut one |
#4
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Dual concentric speaker
On Jun 14, 7:53*am, "N_Cook" wrote:
spamtrap1888 wrote in message ... On Jun 14, 12:42 am, "N_Cook" wrote: Roland cube , tweeter over the 10 inch bass unit. Stands on what seems to be a plastic stem passing through the bass cone, wires to it passing through that cone also. How to remove the tweeter section to get to ,hopefully, failing wiring joint that is normally covered by the dome of a single normal speaker. There is a square recess in that stem, a "Frenchman" to break a plastic weld joint ? no fixings proper seen anywhere. Which speaker element isn't working? Removing the tweeter support should be unnecessary for either repair job. +++++ Working unreliably but not with me of course, probably loss of bass if speaker problem. Accessible joint at cone between a pigtail and intermediary? wire was suspect but as it did not look like VC wire I assume there is another join further in under a ring , access obscured by the tweeter assembly. What does the wire connecting to the pigtail on the cone look like, if not voice coil wire? Have you tried connecting an audio oscillator to the terminals that the pigtails are connected to, and sweeping it? If the tweeter was suspect, wire could be run from the tweeter across the cone, and then down the frame to the mounting terminals, depending where the series capacitor is mounted. Unless it's a piezo. Problem may also have been the "Recording Out" socket with 2 bypass switches inside the Jalco 1/4 in socket. One reduces the speaker output and one cuts speaker supply , via control (not carrying speaker current), I don't know why , perhaps one functions with mono and other with stereo jack inserted via pcb links (not seen as have not taken apart the whole amp). The closure force on the reducing contact only about 200 gram compared to about 400 gram on the full cut one Here you do not need to monkey with the tweeter support, obviously. |
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